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Sexual differences and early eruption timing of the permanent dentition in Mexican adolescents- a comparison with the Caucasian standards

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that the earliest teeth to erupt were the lower first molar followed by lower incisors. The
sequence for eruption that the authors described is the following (in orthodontic
notation): U6,1,2,4,3,5,7 and L6,1,2,3,4,5,7. Also, the eruption of teeth was significantly
positively related to height, weight and sexual maturity. A similar study by Eskeli, was
designed to study the differences in emergence timing and pattern of eruption of
permanent teeth in various parts of Finland.[11] The authors reported that all permanent
teeth, except the maxillary left second premolar, erupted earlier in girls than in boys and
some of the differences were statistically significant. Also, teeth in the incisor and canine
regions where more advanced in the mandible for both sexes. Some tooth groups erupted
earlier than the reported standards and other later and therefore no generalization could
be made regarding the timing of eruption of the total dentition. The authors did not find
any significant regional variations in terms of eruption timing.
Many other articles have been published that report ethnic and regional
characteristics of eruption of the permanent dentition. Blankenstein and others studied
the eruption of permanent incisors and first molars in South African black children and
found that the youngest age of eruption of any permanent tooth was 4.5 and 4.3 years old
for girls and boys respectively. They also reported that eruption ages were delayed
compared to most African studies, but similar to Kenyan and American blacks.[12] In a
similar study, De Melo and others reported that black subjects were more precocious in
dental development than were white subjects from the same Brazilian population.[13]
Rousset studied a sample of French children and found that all permanent
maxillary teeth varied by at least three months from the reported means. Also, compared
to earlier reports for other French populations, there appeared to be a secular trend for

The purpose of this study was to compare the eruption timing of the posterior permanent dentition in Mexican adolescents in reference to the current standards, and to determine if sexual dimorphism is present in the Mexican sample. 257 consecutive records were obtained from a university orthodontic program in Mexico City using established criteria. The eruption of the posterior secondary dentition was recorded for subjects from 8 to 12 years of age, and the data compared statistically to the Caucasian data from a previous study. Significant differences in eruption timing start showing in 8 year old females (p=.044, lower premolars) and 10-year-old males (p=.001, upper bicuspids). For all age groups, the posterior permanent dentition erupts earlier in Mexican patients. For the Mexican sample, evidence of sexual differences in eruption timing was present by age 10, however differences were not statistically significant. Effective diagnosis and treatment planning for patients of Mexican heritage may require assessment at an earlier age.

7
that the earliest teeth to erupt were the lower first molar followed by lower incisors. The
sequence for eruption that the authors described is the following (in orthodontic
notation): U6,1,2,4,3,5,7 and L6,1,2,3,4,5,7. Also, the eruption of teeth was significantly
positively related to height, weight and sexual maturity. A similar study by Eskeli, was
designed to study the differences in emergence timing and pattern of eruption of
permanent teeth in various parts of Finland.[11] The authors reported that all permanent
teeth, except the maxillary left second premolar, erupted earlier in girls than in boys and
some of the differences were statistically significant. Also, teeth in the incisor and canine
regions where more advanced in the mandible for both sexes. Some tooth groups erupted
earlier than the reported standards and other later and therefore no generalization could
be made regarding the timing of eruption of the total dentition. The authors did not find
any significant regional variations in terms of eruption timing.
Many other articles have been published that report ethnic and regional
characteristics of eruption of the permanent dentition. Blankenstein and others studied
the eruption of permanent incisors and first molars in South African black children and
found that the youngest age of eruption of any permanent tooth was 4.5 and 4.3 years old
for girls and boys respectively. They also reported that eruption ages were delayed
compared to most African studies, but similar to Kenyan and American blacks.[12] In a
similar study, De Melo and others reported that black subjects were more precocious in
dental development than were white subjects from the same Brazilian population.[13]
Rousset studied a sample of French children and found that all permanent
maxillary teeth varied by at least three months from the reported means. Also, compared
to earlier reports for other French populations, there appeared to be a secular trend for